QA Recently Answered Questions About CT Scan Real questions recently answered about CT Scan Can you take barium before a Colonoscopy? 1 Even though I had a Cologuard test that was positive, how can I get more proof that I actually need an invasive Colonoscopy? 3 How is inflammatory bowel disease diagnosed? 2 What are some colon screening procedures that don’t require prepping with laxatives and a liquid diet? 2 Would a CT colonography be a good test to do before the full Colonoscopy even after a positive Cologuard test? 3